Guides Backends

Add a Grain backend

Add Grain routes with the @primate/grain module. Write handlers in Grain; Primate compiles them to WebAssembly and wires them like JS routes.

Make sure the Grain executable is available in your PATH. Primate needs it to compile your routes to WebAssembly.

1) Install

Install the Primate Grain package.

$ npm install @primate/grain

2) Configure

Load the Grain module in your configuration.

TypeScriptconfig/app.ts

import config from "primate/config";
import grain from "@primate/grain";

export default config({ modules: [grain()] });

3) Write a route

Compose a route in Grain.

Grainroutes/index.gr

module Object

from "primate/request" include Request
from "primate/response" include Response
from "json" include Json
use Response.{ type Response }
use Request.{ type Request }

provide let get = (request: Request) => {
  "Hello from Grain"
}
provide let post = (request: Request) => {
  Response.json(JsonObject([("ok", JsonBoolean(true))]))
}